| 单词 | wireless beam |
| 释义 | > as lemmaswireless beam a. Radio Communication. In full radio beam, wireless beam: radio waves transmitted as a beam, i.e. undispersed, from a special aerial system, part of which acts as a reflector; usually attributive. ΘΚΠ society > communication > telecommunication > radio communications > [noun] > radio wave > types of space wave1899 surface wave1913 CW1920 beam1924 sky wave1924 ground wave1927 tweek1933 1899 G. Marconi in Jrnl. Inst. Electr. Engineers 28 274 Should it be necessary to direct a beam of rays in one given direction I prefer to use an arrangement similar to a Righi oscillator placed in the focal line of a suitable cylindrical parabolic reflector.] 1924 Marconi 2 July in Jrnl. Royal Soc. Arts 25 July 607/2 The transmission and reception of intelligible signals over a distance of 1¾ miles of a beam system employing short waves and reflectors. 1924 Westm. Gaz. 24 July Arrangements had been made for the erection of a beam station in Canada. 1924 Daily News 14 Nov. 7/4 Beam wireless. 1925 Telegr. & Teleph. Jrnl. Mar. 107/1 Australian papers give the following..information regarding the ‘Beam’ Radio Stations. 1927 Daily Mail 2 Dec. 11/1 Cable Companies and The Beam. 1928 Morning Post 23 Mar. 14 Beam-cable fusion [of the Eastern Exchange Cable Company and Marconi Company]... The beam system of telegraphy. 1934 Nature 24 Feb. 297/2 One advantage of short-wave transmission in radio communication is that it is possible to concentrate the radiation..in one direction, thus forming a beam of waves... A series of vertical aerials..(called a beam array) will act like Hertz's reflector. 1946 Proc. IRE 34 335 (title) A Current Distribution for Broadside Arrays which Optimizes the Relationship between Beam Width and Side-Lobe Level. 1958 Engineering 31 Jan. 157/3 The aerial has been designed to give a sharp beamwidth at high signal strength. At 20 db the horizontal beamwidth extends about 0·65 deg. < as lemmas |
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